CVE-2026-68205

In the Linux kernel, the following vulnerability has been resolved:

media: v4l2-fwnode: Fix subdev owner overwritten in v4l2_async_register_subdev_sensor()

The v4l2 helper v4l2_async_register_subdev_sensor() calls

v4l2_async_register_subdev(), which is a macro that expands to

__v4l2_async_register_subdev(sd,THIS_MODULE). Since the macro is expanded

inside v4l2-fwnode.c, THIS_MODULE resolves to the v4l2-fwnode module

rather than the sensor driver module that originally set sd->owner. When

v4l2-fwnode is built-in, THIS_MODULE evaluates to NULL, which then

overwrites the sensor driver's owner with NULL.

This causes the problem that the sensor module's reference count is never

incremented during async registration, so the module can be removed while

the subdevice is still in use by a notifier (e.g., a CSI-2 receiver

bridge driver).

Fix this by renaming v4l2_async_register_subdev_sensor() to

__v4l2_async_register_subdev_sensor() with an added explicit module

argument and introducing a wrapper macro:

#define v4l2_async_register_subdev_sensor(sd) \

__v4l2_async_register_subdev_sensor(sd, THIS_MODULE)

This ensures the sensor driver module is properly referenced even when

the sensor driver does not init the owner field before calling

v4l2_async_register_subdev_sensor() and prevents premature module removal.